work done 25/04/2013
Merge branch 'master' of https://github.com/openfisca/ga
new files w/ utils
small cahnge of test_ga
Merge branch 'master' of https://github.com/openfisca/ga

Conflicts:
	src/scripts/test_ga.py
Work on nose to be completed
26/04/2013

Splitting test_ga in test_cohorts and test_simulation.

Debugging Nose tests. The fix can be improved but works nonetheless.
Merge pull request #12 from jsantoul/master

Work of Friday 26/04/2013